Pathomorphological caracteristics [i.e. characteristics] of diseases of the respiratory system of cattle | Patomorfoloske karakteristike oboljenja respiratornih organa goveda
2008
Jovanovic, M., Fakultet veterinarske medicine, Beograd (Serbia). Katedra za patolosku morfologiju
The bovine respiratory tract is anatomically and functionally divided into three continuous systems: conducting system, transitional system and exchange system. Each of them has specific structure and function with main aim to prevent or neutralize harmful influence from external environment to developing diseases of the respiratory system. It may be say, that bovine respiratory tract disease is a multi-factorial disease complex involving many non specific factors and several viruses and bacteria. Viruses that play prominent roles in causing the bovine respiratory disease complex (BRDC) include bovine herpesvirus-1, bovine respiratory syncytial virus and parainfluence-3 virus. Bacteria that play prominent roles in this disease complex are Mannheimia haemolytica and Mycoplasma bovis. Other bacteria that infect the bovine respiratory tract are Histophilus (Haemophilus) somni and Pasteurella multocida. BRDC includes enzootic calf pneumonia of young dairy calves and shipping fever of beef and has been the most important cause of economic losses for the beef feedlot industry for many years.
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